Chuck



Dec. 26, 1944. w. .J. FASO 2,355,810

CHUCK Filed Apri1 5, 1944 2 Sheets-Sheet l Dec. 26, 1944. w. FASO 2,365,810-

CHUCK Filed April 5, 1944 2 Sheets-Sheet 2 Y IN VEN TOR.

Y MLU/Ml J' F2130 Patented Dec. 26, 1944 UNITED STATES OFFICE k f CHUCK Y William J. Fast, Bayside, N. Y. Applicautnlaprii y5, 1944, senarNd. 529,591

.4 ciaims. (ci. 279-9) i This invention relates to an improvement `fuselages and the like.

The drills are usually `secured to the extension rod by boring a hole in the end of v,the.rodiand then brazing the shank of the drill inthe' hole. The opposite end 'lof the rod is then received in the drill chuck so that the extension rod .with the drill thereon forms in effect a long drill element.

Itis inherent that such extension rods havema certain amount of whip or a `tendency tov bend,

with the result that the drills, especially the small drills commonly used, Yare subjected to bending stresses and are readily broken; The great number of drills that are xbrokenandthe difficulty of and the -timeconsumed infattaching the drills to the extension rods hasbeen .a problem of major importance in the aircraft. in-y dustry and in many other industries.

It would be highly ydesirable if some fform `of chuck were available which would permit Va drill to be attached to the extension rod Vand i the drill readily replaced if and Whenit is broken.

Moreover, it would be highly desirable to provide extension drill chucks which Would act to reinforce the .drills and thereby minimize breakage thereof `and which at the same time would 4permit the reuse of the broken drills after they have been resharpened.

An object of the presentinvention, raccord? ingly, is to provide drill chucks of simple and compact form Which'perrnit a drill to be attached ftowand .detached Afrom an extension rod .easily andina minimum amount of time.

Anotherobject of the inventioniis to vprovide a drill chuck capable of use directlyin the chuck of a` drilling machine or on anvextensionrodand which acts to reinforcea portion of the'drillwhile exposing only the' portion of the drill bitithatisv required in the .drilling operationythereby `protecting and strengthening the drill. l

Anotherobject ofthe invention is to provide a relaizedseriesofY chucks ofthe type .embody- `ingzthe invention i which are y graduated in length" so thatwhen a drill is broken, While in use in a longer chuck of the'l series, it may be' reground andginserted in agshorter chuck tothereby expose `a ,sucient length of Ithe drill to .permit drilling operations'tolbe carried out with the reground drill. l

Anotherobject of `the invention' is to provide a Q related series" of .chucks that' are capable `of` receiving `and holding, drills 4of different sizes, said chucks being interchangeable von an extension rod or ina drilling device.' l

.Other types ofjdrilling devices that are commonly `used in many industries are ,the Uangle drill and the snake ldrill; ,Suchndrilis include a chuck .that is either arranged at an angle to the axis `olimtljre Vshaft that jdrives the` chuck or is mountedjon a ilexiblc-S.shaft4 permitting the drill bit to beintroduced into sinall spaces. The chucks commonlylu'sed with these drills usually include an'inner slotted'sleeve that is compressed by an external camming sleeve to grip the ,shank These elements are usuallysmall of the drill. f and are easily lost. Moreoven it is a time-consuming operation to change the drill-v receiving sleeve each time'ay drill of `a diierent size is used Withthe'angle drill. f

Another disadvantage 4of these prior angie drills isthat the chucks are not standardized and the chucks iorithese vdevices cannot ybe interchanged. Therefore, in industries 'wherein angle drillsmade by different manufacturers are used, .considerable 'confusion occurs when parts `of the chucks are reordered or replaced.

Another object of. the .presentinv'enticm .therefore, is to provide simplified forms kof chucks for such angle drills.

A further object of the invention is to .provide `chucks .that care usable with `substantially all -typesLof .angle ,di-ills .that are `manufactured at the. presenttirne.

:Other obiectsof the invention Willbecomeapparent from the followingtdescription of `typical `forms of chucks'embOdying the present invention.

In general, chucks of thetype embodying the present invention may consist of atubular member havinga bore orpassageway of the proper size to receive a conventionaltwist drill .so that the shank and a vportion .of the .twist drill may be inserted Within the .tubulanmemberin sufl iiciently 4closely ztting relationship to `prevent that rotation of the drill, without axial movement relatively to the chuck, is prevented, and the drill is driven through the intertting engagement of the non-circular wall portions of the bore with the utes of the drill.

When a chuck of the type generally described above is used in conjunction with an extension rod, the inner end of the chuck may be provided with threads for engaging a threaded portion on the end of the extension rod or a threaded portion of an adapter interposed between the chuck and the extension rod. When extension rods of the conventional solid type are used, the inner end of the chuck is preferably threaded internally for receiving a threaded stud on the end of the extension rod. Consequently, during a drilling operation the drill will engage the end of the stud which furnishes endwise support and also serves, in cooperation with the non-circular bore portion of the chuck, to prevent relative rotation of the chuck and drill.

Devices of the type embodying the present invention have the advantage of permitting ready interchanging of drills of the same size on extension rods. l

A series of chucks having threads tting an extension rod may be provided with different size bores, so that a series of drills may be used with a single extension rod.

Similar chucks may be provided for use with angle drills and adapters provided therefor that permit the use of the chucks with any of the angle drills now manufactured.

Chucks embodying the present invention may be used in a jaw chuck of a conventional drilling apparatus as well as on an extension rod or in an angle device. A set of these chucks of different lengths, but the same diameter will permit the repeated use of broken drills, thereby' l 2-2 of Figure l;

Figure 3 is aview in section taken on line 3-3 of Figure 1;

Figure 4 is a view in section taken on line 4-4 of Figure 1;

Figures 5, 6 and '7 are side views of a series of chucks of the type embodying'the present invention, illustrating different sizes of chucks and showing their use with drills which have been broken and reground;

Figure 8 is a view in side elevation and partly broken away showing a modified form of chuck;

Figure 9 is a view in section taken von line 9--9 of Figure 8;

Figure 10 is a view in section of a modied form of extension chuck; Y

Figure 11 is a view in cross-section taken on line II-II of Figure 10; i

Figure 12 is a view in section of a modied form of chuck illustrating the use of such a chuck with a smaller drill;

Figure 13 is a View in section of another form of chuck embodying the invention,fincluding a ting portions or within the iiutes of the drill so plug element for positioning the drill against axial movement;

Figure 14 is a view in section of a modifled form of chuck and adapter for an angle drill;

Figure 15 is a view in section of a chuck and adapter for an angle drill including a plug for positioning the drill bit against axial movement;

Figure' 16 is a view in section of another form of chuck embodying the present invention;

Figure 17 is a View in section taken on line II-I'l of Figure 16; and

Figure 18 is a View in section of a modified form of chuck for an angle drill.

As illustrated in Figures 1, 2, 3 and 4 of the drawings, a typical form of chuck embodying the invention may consist of a tubular member I0 having a circular bore II therein extending a portion of the length of the member I0 and of substantially the same diameter as the shank I2 of a twist drill I3. It will be understood that the member I0 may be of any desired internal diameter to receive drills of a desired size and that the bore II need not be of circular crosssection so long as it receives the drill I3 closely and without Wobbling. As shown particularly in Figure 4, the bore II receives the shank I2 of the drill I3 very closely, but with a sliding fit so that the drill can be inserted from the left hand end of the member I Il and received therein. As illustrated in Figure 3, the bore II is circular up to within a short distance of the right hand end of the chuck I0 so thatit engages and reinforces the twist portion of the drill.

Referring now to Figure 2, the right hand end of the chuck I0 contains a non-circular aperture I4 therein having curved ends Ma closely fitting against the blades of the drill and relatively at sides Mb which are spaced apart a suilicient distance to engage the edges of the cutting blades of the drill I3. This arrangement permits the drill to be received through the opening I4, but prevents the drill from passing entirely through the member I0 for the reason that the opening I4 is smaller than the shank I2 of the drill.

In order to secure the member I0 to an extension rod, it may be threaded internally for receiving a threaded stud I5 on an extension rod I6. The threaded stud I5 forms an abutment for preventing endwise movement of the drill to the left. It will be understood, of course, that the threads in the tube I0 and on the extension vrod I6 are so formed as to cause the tube I and the rod I 6 to be screwed together during a drilling operation and that the positions of the threads on the rod I6 and the member I 0 may be reversed. y

With a chuck of the type described above, a drill may be readily inserted Within the tube I0 `and the tube then attached to the end of the extension rod I6. If the drill isibroken during use, the member I0 may be unscrewed from the extension rod I 6, a new drill of the same size inserted in the member I0 and the latter again attached to the extension rod I6. Moreover, if the twist portion is broken off where it joins the shank, the twist portion, alone, may be used in the member I0.

In order to permit the reuse of drills that are broken, a series ofchuck members ID, Ilia and Ib of different lengths, but having the same internal diameter, may be provided, as shown in Figures 5, 6 and 7. Thus, the member IIJ may be of such length that only a relatively small amount of the drill I3 is exposed. lI'he remain-v der of .the drill is reinforced and rigidied by the `member -l-Il and the chuck may act as a depth gauge; Should the exposed portion vof the drill Ii3"bebroken, `it caribe removed' Vfrom the member |'|l,fregrcund and then usedin a shorter chuck member Illa. Similarly, if the exposed endlof the drill `is again broken off, the drili can be reground and used in conjunctionV with a still shorter chu-ck -member lb, as shown in Figure 7. Thus, lby providing 4a 'related series of chucks,A brokenldrillsmay be used a number of times. i Inasmuch` `as the vchucks are not .broken as easily as the ldrills, it will be apparent that oneset of chucks will outlast a large number of anus. .i i

As shown in the drawings, the lef-t hand. ends ofthe chucks `may be knurled to facilitate their attachment to orvrelease from an extension rod.

The i chuck disclosed in Figure '7, and in fact any of. the` chucks described above, may be 'used Withf a` conventional `javv type vof chuck in adrilling apparatus; Preferably, when my chuck .is

chuck to be pressed against the drill shank and thereby grip and retain it against endwise movement. i l r A modified type of chuck is illustrated in Fgures 8 and 9; Because of the difficulties at the Y present time of obtaining machinery for broaching the non-,circularhole I4 in the end of the chuck l0, it may be found desirable to forrnv the hole `in a differentway. Thechuck `may be formed of an-elongated tube 20 having a circular vbore 20a completely therethrough. Before the tube 20 is hardened, one end portion of the tube 2lil may be punched 4to form protuberances 2l projecting into the bore` from opposite sides thereof, thereby forming a generally figure-8 shaped opening `23l which closely receives the drill 24. Inasmuch as the `grooves in the drill 24 are spirally disposed, the protuberances 2| are inclined atan angle to the axis of the tube 20, substantially parallel to the inclination of the spiral grooves or` iiutes of the drill so that the drill can be inserted and removed without jamming. It will be understood that only one protuberance 2l need be provided` but better balance at high speeds is ,obtained with two. After the end of the tube 2B has been given the desired shape, the entire tube 20 may be subjected to a hardening treatment.

The form of" extension chuck illustrated-in Figures 10 and 1l is similar to those forms described above in that it includes a tubular member 25 which is initially of cylindrical, annular form. `The internal `diameter of. the tubular member 25 may be such as to t closely around the' shank 26a and the fluted portion 26h of the drill `26. One endof the member 25 is provided with an internally threaded portion 25a for receiving the threaded end portion 21a of an extension rod 2l. `TheoplOOsite end of the tubu- `lar member .25 is provided with inwardly extending projections 25h that are formed` by punching in the ,sidewalls of the tube so that the projections orY dimples fit closely within the iiutes of i Athe drill 26. The formation of the projections 25h `in the manner describediabove greatly simplies the manufacture of the chucks, inasmuch 1 as expensive and complicated machining opera-y can be produced for receiving.l drills of different sizes and at `the same time being usable' with :a commonextension rod for the series. This form of chuck includes a tubular member 28 having a` centrally disposed bore 28a therein of larger diameter than the drill 29. This larger bore 28a is `provided with threads 28h' at one .end for receiving the threaded end of the extension rod .3.0. The opposite end-28e `of .the tubular member 28 is reduced in `external diameter and is provided with abore 28d` of such diameter as to t closely about the shank and iiuted `portions of the' drill 29. The diameter of the bore 28d may be varied to fit various sizes of drills. Thus, the bore 28d may be of smaller `diameter than illustratedor it `may be as large as .the diameter of the .bore 28a.

The reduced end portion 28o of the chuck may also .be provided with punched-in projections' 28e which'engage in the flutes ofthe drill 29.

An advantage of the type of chuck disclosed l in Figure 12 is that by reducingthe diameter Vof the forward end of the chuck 28, better visibility of the work is obtained and less difculty is encountered in centering thedrill 29 inthe desired position on the work.

The above-described forms of chucks usually permit a certain :amount of axial movement of the drill in the chuck inasmuch as -thevleng-th of the shank portion of the drill usually will be less than the spacing between the 4extension rod and the projections in thel chuck. If such endplay or backlash is undesirable, it can be overcome by the form of chuck disclosed in Figure 13. This chuck `includes a tubular member 3i having the projections Slapunched-in its forward end and a bore portion 3lb for receiving the shankand fluted portion of the drill 32 closely. The left hand end of the member `3l is provided with internal threads 3io extending about one-half the length of the member 3l and of an inside diameter at least equal to the diameterof the bore 3| b. The threaded portion 3| c is adapted to receive the threaded portion of the extension rod 33 and also a threaded adjusting Vplug 34 which is provided with a kerf 34a by means of which'it may be adjusted'axially of the member that the drills can be used in relatively inaccessible places. Usually such drills include interchangeable split collets which are clamped about a drill by means of a ycamming sleeve that is threaded into a portion of the chuck. The elementsV of such chucks normally being small, vthey are easily lost. Moreover, they are difticult to change whendifferent sizes of drills are to vbe used in the angle drilling device.

A suitable form of chuck embodying the presi 'ent' invention for use in such angle drills lis disclosed in Figure 14. This chuck includes a tubular member 35 having `a nut portion 35a thereon, `an enlarged externally threaded end portion 35h thereon and a reduced tubular portion 35e.

As illustrated, the member includes a central bore 35d-of substantially uniform diameter throughoutthat-:receives the shank anda ,part of the iiuted portion of the drill. The reduced portion 35e is provided with inwardly punched projections 35e which engage within the flutes of the drill 3B. f

The opposite threaded end portion 35h is provided with a thread that will t one form of angle drill so that chucks of this type can be readily attached to and detached from they angle drill. It will be understood that a chuck of the type disclosed in Figure 14 may be provided with bores 35d of any desired diameter and a series of such chucks may be' provided for receiving drills of different diameters for replacement in the angle drilling device'. t

Inasmuch as the angle drill devices made by various manufacturers have sockets for receiving the threaded portion 35h that are of different diameters and include different pitch threads, a chuck of the type described ab-ove cannot be used universally. However, the chuck may be provided with an adapter 31 having an internally threaded portion 31a adapted to fit the threaded portion 35h of the chuck and another threaded external portion 31h which i's provided with threads that will t another form of angle drilling depletely replacing the adjustable jaw chucks commonly used on 'ordinary drilling devices.

The drill 36 in many instances has a shank of such length that it will be positioned with relatively little capacity for axial movement in the chuck when the chuck is inserted in an angle drilling device or is used with an adapter such as the adapter 31. However, in some instances it may be found that there is a certain amount of backlash in the drill. This backlash can be overcome by the use of a chuck for an angle drill such as that disclosed in Figure 15. This form of chuck includes a tubular member 40 similar to that disclosed in Figure 14 including the reduced tubular portion 40a. for receiving vthe drill, the

nut member 4Gb and an elongated internally and l externally threaded shank portion 40e. The external threads on the portion 40e are adapted to be received in the adapter 31 or in the socket of an angle drill. The internal threads Mld of the extension 40e are adapted to receive an externally l' threaded adjusting plug 4I for engagement with the inner end of the drill 42 to urge it into a position such that the punched-in projections 40e engage in the inner ends of the flutes of the drill 42.

This form of chuck can also be modilied to receive various sizes of drills by increasing the diameter of the sleeve portion 40a or decreasing it, as the purpose demands. Thus, the sleeve portion 40a may have a b-ore therein smaller than illustrated in Figure or as large a diameter as the internal diameter of the threads 40d so that the drill can be inserted from the rear end of the chuck 40. While a threaded connection between the chuck and the adapter or other drill fitting is preferred, it will be understood thatl other forms of connections may be used such as a pin and non-circular socket or a bayonet slot fitting.

yThe chuck illustrated in Figures 16 and 17 is particularly useful forreinforcing drills or for permitting the use of broken drills in an ordinary drilling device having a conventional type of jaw chuck. This device includes a tubular member 45 having a central bore 45atherein of substantially the shape and diameter of a drill 46 to be received therein. One end 45h of the chuck may be reduced in external diameter, butis continuous in order to aord adequate support for the drill, This reduced end portion 45h is provided with inwardly punched projections 45e for engagement in the flutes of the drill 46. The opposite enlarged portion of the tubular member 45 may be provided with one or more slots 45d terminating short of the end portion 45h so that the portion containing the slots 45d may be compressed around the drill shank or a fluted portion of the drill to retain it in the chuck 45.

Chucks for use in angle drills may be slotted similarly to the form of chuck disclosed in Figures 16 and 17 in order to permit the use of broken drills therein. Such an angle chuck is illustrated in Figure 18. This chuck includes a tubular portion 50for receiving a drill 5I closely and having the inwardly punched projections 50a for fitting in the nutes of the drill 5 I. The tubular member 50 is provided with a nut portion 50h for attaching the chuck to and detaching it from the threaded socket of an angle drill and is provided with a tapered threaded portion 50c adapted to be received in the threaded portion of the angle drill. The threaded portion 50c is provided with one or more slots 50d extending parallel to the axis of the threads so that the threaded portion can be compressed against the drill 5i to retain it against endwise movement.

lFrom the preceding description of typical forms of devices embodying the present invention, it will be apparent that I have provided extremely simple, yet effective chucks for receiving and retaining conventional types of twist drills and that such chucks are capable of permitting the ready replacement of drills of the same or different size, the reuse of broken drills and of rigidifying and strengthening such drills while in use.

The chucks can be suppliedin related sets, similar to socket wrench sets, permitting their use with substantially rany type of hand or motoractuated drill and greatly facilitating the interchange of the drills. Moreover, in many industries where a drilling' 'device is used with only one size of drill, my chuck can be substituted readily for the adjustable chucks, commonly used, at a marked saving in cost. v

It will be understood that chucks of the type embodying the present invention are susceptible to considerable modification in shape and size and that they are adaptable for uses other than those described above. Therefore, the forms of chucks illustrated herein should be considered as illustrative and not as limiting the scope of the following claims. l

It will be further understood that the chuck may be used with various types of twist or spiral drills and that the shank portion may be of the same diameter as the twist portion or of a different diameter. In those cases where the shank of the drill is of an external diameter corresponding to that of a circle inscribing at least a substantial part of the depth of the ilutes of the drill, it is ,insured that the inwardly extending driving projections carried by the outer annular, unbroken wall portion of the open-ended member Vwill be brought into engagement with the shank portion at the ends of the flutes in case the drill-chuck assembly is disposed with the `and 15.

drill depending downwardly, thus preventing the drill from falling out of the chuck when it is to be connected and driven in any of the ways shown, for example, in Figs. 1, l0,` 12, 13, 14

Where, in the appended claims, reference is made to inwardly extending projections carried by the outer, annular unbroken wall portion of the open-ended member or chuck, it is to be understood that the term projections is to be construed as including a single projection or one or more equivalent protuberances or deformations of the wall surfaces, including the various examples illustrated in the drawings, that will establish driving connection with the flutes of the drill but which will serve to prevent the shank portion of the drill from passing the thus restricted portion of the bore. n

lI claim:` l

` 1. In a chuck for twist drills having a helically fluted portion and a cylindrical shank portion of an external diameter corresponding to that of a circle inscribing at least a substantial part of the depth of the flutes of said drill, an open-ended member having, adjacent one end thereof, an annular unbroken wall portion defining a bore adapted to establish a sliding t with the peripheral surfaces of the flutes of a twist drill inserted therein and another wall portion defining -a continuation of said bore extendingr toward the ooposite end of said member, said bore continuation having a diameter at least as great as the maximum external diameter of said drill to permit the drill to be inserted from said opposite end, and said annular unbroken wall portion having projections extending inwardly into said first-mentioned bore for engagement with the flutes'of said drill to transmit driving motion to said drill at the points of engagement of said projections with open-ended member adjacent said oppositeY end thereof for limiting retrograde movement of said drill.

2. In a chuck for twist drills having a helically fluted'lportion, an open-ended member having,

adjacent one end thereof, an annular unbroken wall portion defining a bore adapted to establish a sliding fit with the peripheral surfaces of the utes of a twist drill inserted therein, andanother wall portion dening a continuation of said bore extending toward the opposite end `of said member, said bore continuation having a `diameter at least as great as the maximum external diameter of said drill to permit the drill to be inserted from said opposite end, and said annular unbroken wall portion having projections extending inwardly into said first-mentioned bore for engagement with the nutes of said drill to transmit driving motion to said drill at the points of engagement of said projections with said utes, and the open-ended member having a slot extending axially therealong from said opposite end 'toward but terminating short of said unbroken wall portion, said slot permitting compression of the slotted portion of said open-ended member to grip said drill and maintain it in fixed position lengthwise of said bore.

3. In a chuck for twist drills having a helically fluted portion and a shank portion of an external diameter corresponding to that of a circle inscribing at least a substantial part of the depth of the utes of said drill, an open-ended member having, adjacent one end thereof, an annular unbroken wall portion defining a bore adapted to establish a sliding fit with the peripheral surfaces of the flutes of a twist drill inserted therein and having another wall portion dening a continuation of said bore extending toward the opposite end of said member, said bore continuation having a diameter at least as great as the maximum external diameter of said drill to permit the drill to be inserted fromsaid opposite end, and said v annular unbroken wall portion having projections extending inwardly `into said first-mentioned bore for engagement with the llutes of said drill to transmit driving motion to said drill at the points of'engagem'ent of said projections with the flutes of said drill, and said projections further being of a size sufficient to engage with the shank portion of said drill to prevent the drill from falling out of said open-ended member when the assembly is disposed with the drill depending downwardly, and said member being threaded adjacent said opposite end thereof for engagement with means for limiting retrograde movement of said drill.

4. An extension chuck assembly for twist drills having a helically iluted portion and a shank portion of an external diameter corresponding to that of a circle inscribing at least a substantial part of the depth of the ilutes of said drill, comprising an open-ended member-having, adjacent one end thereof, an annular, unbroken wall portion defining a bore adapted to establish a sliding t with the peripheral surfaces of the flutes of a twist drill inserted therein and having another wall portion defining a continuation of said bore extending toward the `opposite end of said member, said bore continuation having a diameter at least as great as the maximum external diameter of said drill to permit the drill to be inserted from said opposite end, and said annular unbroken wall portion having projections extending inwardly into said inst-mentioned bore for engagement with the flutes of said drill to transmit driving motion to said drill at the points of engagement of said-,projections with the flutes of the drill, and said projections further acting by engagement with the shank portion of said drill to prevent the drill from falling out of the bore of said open-ended member when the assembly is disposed with the drill depending downwardly, and means connected to said member at said opposite end thereof for providing an extension for connecting said' member to rotatable driving means, said extension means carrying abutment means for limiting retrograde movement of said drill.

` WILLIAM J. FASO. 

